A cenotaph is an empty tomb or a monument erected in honour of a person or group of people whose remains are elsewhere. It can also be the initial tomb for a person who has since been reinterred elsewhere. Although the vast majority of cenotaphs honour individuals, many noted cenotaphs are instead dedicated to the memories of groups of individuals, such as the lost soldiers of a country or of an empire.

The Cenotaph is a war memorial on Whitehall in London, England. Designed by Sir Edwin Lutyens, it was unveiled in 1920 as the United Kingdom's national memorial to the dead of Britain and the British Empire of the First World War, was rededicated in 1946 to include those of the Second World War, and has since come to represent the Commonwealth casualties from those and subsequent conflicts. The word cenotaph is derived from Greek, meaning 'empty tomb'. Most of the dead were buried close to where they fell; thus, the Cenotaph symbolises their absence and is a focal point for public mourning. The original temporary Cenotaph was erected in 1919 for a parade celebrating the end of the First World War, at which more than 15,000 servicemen, including French and American soldiers, saluted the monument. More than a million people visited the site within a week of the parade.